Picked this barrel up a couple months ago at my proshop. It was only 40 bucks. This barrel is awesome! It is dead-on accurate. I can get a 1' x 1' grouping at 40 feet. The design of the barrel is great. The first 8" allows for the expansion of gas(Co2,HPA), The remaining length guides the ball, and then the spiral porting spins the ball and gives it the same effect as a bullet exiting a real gun; the porting also equalizes the air pressure behind the ball, so a puff of gas won't give the ball an erratic flight pattern. Overall, this is a very accurate and quiet barrel.